Sometimes I need to add some classes to the `picture` tag of Media
component. in this case I need to do this:
```
<Media
resource={content.image}
className="w-full h-full [&>picture]:w-full" // <<< follow this
imgClassName="w-full h-full object-cover"
/>
```
So I added an additional props `pictureClassName` for the picture tag.
Now I can do this:
```
<Media
resource={content.image}
className="w-full h-full"
pictureClassName="w-full h-full" // <<< follow this
imgClassName="w-full h-full object-cover"
/>
```
NOTE: I've encountered situations where I needed to add classes to the
`picture` tag, not just for `w-full h-full`. To handle this, I had to
update the Media component. I believe this would be a valuable
improvement to the Media component.